Enabling Mtu Signaling; Configuring Ldp Instances; Configuration Prerequisites; Configuration Procedure - 3Com MSR 50 Series Configuration Manual

1332 C 76: MPLS B
HAPTER

Enabling MTU Signaling

Configuring LDP
Instances
Configuration
Prerequisites

Configuration Procedure

C
ASICS ONFIGURATION
Follow these steps to configure LDP MD5 authentication:
To do...
Enter system view
Enable LDP capability and
enter MPLS LDP view
Configure LDP MD5
authentication
For correct path MTU detection, an IP router needs to know the MTU of each
connected link.
LDP can automatically calculate the minimum MTU of all interfaces on an LSP. At
ingress, MPLS uses the calculated minimum MTU to determine the size of the
MPLS forwarding packets, preventing a packet of a bigger size from being
dropped by a transit LSR.
Follow these steps to enable MTU signaling:
To do...
Enter system view
Enable LDP capability and enter
MPLS LDP view
Enable MTU signaling
n
Enabling/disabling MTU signaling will cause existing sessions to be reestablished
and all LSPs of the sessions to be reestablished accordingly.
LDP instances are for MPLS L3VPNs. You must configure LDP capability for them.
Except for the command for the LDP GR feature, all commands available in MPLS
LDP view can be configured in MPLS LDP VPN instance view.
Before configuring LDP instances, be sure to complete these tasks:
Configuring VPN instances
■
Configuring MPLS basic capability
■
Configuring MPLS LDP capability
■
Usually, the default value of the LDP LSR ID, that of the MPLS LSR ID, answers the
requirement. In some networking schemes where VPN instances are deployed,
such as MPLS L3VPN networking schemes, if VPN address spaces and the public
network address space overlap, you must configure an LDP LSR ID that is different
from the MPLS LSR ID for TCP connections to be established normally.
Follow these steps to configure LDP instances:
Use the command...
system-view
mpls ldp
md5-password { cipher |
plain } peer-lsr-id password
Use the command...
system-view
mpls ldp
mtu-signalling
Remarks
-
Required
Required
Disabled by default
Remarks
-
Required
Optional
Enabled by default